Coherent Breathing Timer: ~5.5 Breaths / Minute
Coherent breathing (also called resonant breathing) is slow, even breathing with no holds — equal inhales and exhales that bring you to roughly 5–6 breaths per minute, the rate at which heart rate variability peaks. This timer paces a smooth 5-seconds-in, 5-seconds-out rhythm you can sustain for 5–20 minutes.
Coherent
Heart rhythm sync. Tap to begin your breathing exercise.
The pattern: Inhale 5s → Exhale 5s (no holds)
Press Start and the animated dandelion breathes with you — it grows as you inhale and releases its seeds as you exhale. No signup, no download, no ads.
What is coherent breathing?
Every cardiovascular system has a resonant frequency — a breathing rate at which heart rhythm and breath synchronize and heart rate variability (HRV) reaches its maximum. For most adults that rate sits between 4.5 and 6.5 breaths per minute, commonly cited as 5.5. Breathing there produces the large, smooth heart-rate oscillations that biofeedback clinicians use as a marker of autonomic balance.
HRV matters because it reflects your nervous system's flexibility — the ability to shift between alert and calm as circumstances demand. Higher resting HRV is associated with better emotional regulation, lower anxiety, and better cardiovascular outcomes. Resonant-frequency breathing is the core of clinically studied HRV biofeedback protocols for anxiety, depression, and hypertension.
Unlike the physiological sigh (an acute rescue tool) or box breathing (pre-performance focus), coherent breathing is a training practice. The payoff builds with regular sessions: 10–20 minutes daily raises baseline HRV over weeks, the way consistent easy runs build aerobic fitness. It's also the easiest technique to sustain — no counting complex ratios, no holds, just a smooth pendulum of breath.
When to use it
- →Daily HRV training: 10–20 minutes at the same time each day is the standard biofeedback protocol. Morning sessions set a calm baseline; evening sessions aid wind-down.
- →During meditation: The even rhythm gives a wandering mind an anchor without the cognitive load of counting patterns.
- →Emotional regulation practice: Regular practice widens the gap between stimulus and reaction — useful if you're working on responding rather than reacting.
- →Longer stress recovery: After a hard day, 10 minutes of coherent breathing settles the system more durably than a few quick sighs.
How to do it — step by step
- 1Sit comfortably: Spine tall but relaxed, eyes closed or soft. You'll be here a while, so comfort matters more than posture perfection.
- 2Breathe in for 5 seconds: Slowly through your nose, letting your belly expand — diaphragmatic breathing deepens the HRV effect.
- 3Breathe out for 5 seconds: Through your nose, smooth and unforced. No pause at the top or bottom — the transition should feel like a pendulum changing direction.
- 4Continue for 5–20 minutes: Start with 5 minutes and build up. If 5-5 feels strained, try 4-4 and lengthen over sessions; if it feels easy, 5.5-5.5 or 6-6 moves you closer to your personal resonant rate.
Frequently asked questions
Why 5.5 breaths per minute?
5.5 breaths per minute is the commonly cited average resonant frequency — the rate at which breath and heart rhythm synchronize and HRV peaks. Individual resonance ranges from about 4.5 to 6.5 breaths per minute. This timer's 5-in/5-out rhythm (6 breaths per minute) sits within that resonant band and is the easiest even count to follow; extend toward 5.5s per phase as it becomes comfortable.
How is coherent breathing different from box breathing?
Coherent breathing has no holds — just smooth, equal inhales and exhales — and is meant for long sessions that train baseline HRV. Box breathing adds two 4-second holds and is a short, acute tool for focus under pressure. Think training plan versus rescue inhaler.
How long until coherent breathing improves HRV?
Acutely, HRV rises within the session itself. Baseline improvements typically show up after 4–8 weeks of regular practice — HRV biofeedback studies usually run 10–20 minute daily sessions over 5–10 weeks. Consistency beats session length.
More than a timer
Reflect includes all 10 guided breathing exercises free — no signup needed to use this timer. If you ever want a calm, private place to write after you breathe, the journal is free too. No streaks, no ads, and we never train AI on your entries.